ARKSEN 1/2HP Single Stage 5CFM Vacuum Pump + A/C Manifold Gauge Kit for R134a Oil viewing windows allows you to monitor oil quality and levels Oil drain plug located at bottom of oil reservoir Manifold: Operating Pressure: 600 PSI, Burst Pressure: 3000 PSI Manifold r134a: Quick disconnect couplers for high/low fittings included Free Air Displacement: 5 CFM, Power: 1/2 HP, Pump Speed: 1720 RPM, Voltage 110V @ 60hz